Continuous method of rolling metallic broad bands and strips



De c. 22, 1942. H. PUPPE 2,305,793

CONTINUOUS METHOD OF ROLLING METALLIC BROAD BANDS AND STRIPS Filed July 1, 1959 2 Sheets-Shed; 1

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Dec.Z2, 1942. H, PUPPE 2,305,793

CONTINUOUS METHOD OF ROLLING METALLIC BROAD BANDS AND STRIPS Filed July 1, 19:59 '2 Sheets-Sheet 2 WWI/,4

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Patented Dec. 22, I942 CONTINUOUS METHOD OF ROLLING ME- TALLIC BROAD BANDS AND STRIPS Heinrich Plume, Thale-on-the-Barz, vested in the Alien Property Custodian Application July 1, 1939, Serial No. 282,382 In Germany December 17, 1937 6 Claims. (CI. 80-60) The invention relates to a continuous method of rolling metallic broad bands and strips and particularly to the hot-rolling of steel bands and steel strips of which the width is greater than 600 millimetres.

It is a main object of this invention to prevent the lateral displacement of the bands or strips during their passage through the rolls as in consequence of such deviation the travelling strip may impact upon an adjacent roll stand and due to its high travelling speed the advancing heavy band may cause serious damage of the installation and create undesirable shutdowns.

It is the further object of the invention to provide for the band travelling through the mill a reliable guidance so that independently of the number of the successive roll stands the distance between the edges of the travelling band and its centre line always remains equal.

It is another object of the invention to insure the production of accurately dimensioned bands of which the thickness is uniform over the entire cross area.

' A further object of the invention consists in automatically removing and scaling oil the cinder from the band during its advance through the successive roll stands and to prevent the scale being rolled into its surface thereby causing defective spots and waste.

It is also an object of this invention to eflect a thorough working of the band passing through the rolling mill and to insure a satisfactory condition and shape of its edges.

As generally known in the hot-rolling of broad metallic bands and strips and particularly steel bands and strips having a width of more than 600 millimetres a great dimculty resides in the correct guidance of the broad hand through the roll stands. These large bands have an enormous weight; they are passed through the mill at a very high speed and they have a pronounced tendency to shift laterally and to deviate from the normal central pass creating a, great danger to the installation.

This drawback of the customary broad band rolling methods is prevented according to the present invention by bending the band in a direction transversely to its path of advance through the mill; that is to say, the cross section of the band will appear as upward or downward bent when the transverse or cross bending is effected upwardly or downwardly respectively or alternately; it may be combined with an intermediary or final straightening of. the band.

A mill of which the roll openings are curved and the rolls of the individual stands are of convex or of concave shape may be advantageously used, such rolls being shown in my prior Patent 2,121,929.

The interposition and the addition of straight rolls facilitates the advance of the hand through the rolls and reduces the costs of installation and operation straight rolls being cheaper and easier to exchange and to replace than convex or concave rolls.

The cross-bending of the band has the further great advantage that the nonelastic scale is continuously forced off the same and a final product is obtained having a smooth and iaultness surface.

The cross-bending of the strip also serves to insure an excellent working-through of the material over its entire cross section as the individual particles are subjected to a continuous change of location, flow and pressure. Thus the uniformity of the final products is greatly improved.

The transport of the band in its cros:-bent shape through the successive roll stands and in particular the alternate up and down bending equalizes differences of the thickness of the band and the thickness of the thus produced bands therefore shows no variations The invention is illustrated by way of example in the attached drawings of which Fig. 1 shows a side elevation oi a rolling mill for carrying out the present method,

Figs. 2 and 3 show a front view of individual rolling stands,

Figs. 4 to 11 show the change of the crosssection of the band passing through the successive roll stands according to the various embodiments of the invention.

As shown in Fig. 1 the work is transported from the left side into the rolling mill and passes through the individual roll stands I-V which are constructed as multiple roll stands. each with two inner working rolls l, 2 or i, 2 of relatively small diameter and two outer supporting rolls 3, i or 3', i of" larger diameter. In other respects the construction of these roll stands, which are equipped with the usual driving and adjusting means, is known.

The rolls which are used in carrying out the present process are shown in Figs. 2 and 3. The rolls I and 2' are concave and the rolls l' and 2 are convex.

Before, between and behind the roll stands are provided rollers 5. As Figure 1 shows, the work may be given a looped form it this should be desirable.

In Fig. 4 through 11 several modes of carrying out the invention are illustrated.

Fig. 4 shows the change of the cross section of the band in five of a series 01 successive roll stands, the band being passed through'the rolling mill in an upward bent shape.

Fig. 5 shows the change of the cross section of the band in five of a series of successive roll stands the band travelling through the mill in a downward bent shape.

Fig. 6 shows the change of the cross section of the band in five of a series of successive roll stands the band in travelling through the mill being bent upward and downward.

Fig. '7 shows the change of the cross section of the band in five of the successive roll stands the band in travelling through the mill being alternately bent upward and downward, these working steps being partly performed in two successive roll stands.

Fig. 8 shows the change of the cross section or the band in five of a series of succesive roll stands the band in passing through the mill being alternately bent upward and straightened.

Fig. 9 shows the change of the cross section of the band in five of a series of successive roll stands the bandin passing through the mill being alternately bent downward and straightened.

Fig. 10 shows the change of the cross section of the band in five of a series of successive roll stands the band in passing through the mill being alternately bent upward and downward and straightened.

Fig. 11 shows the change of the cross section of the band in five of the successive roll stands the band in travelling through the mill being alternately bent upward and downward and straightened, these working stages being partly performed in more than one successive roll stands.

Simultaneously with the bending of the band transversely of its advance direction a reduction in thickness takes place. The upward and downward cross bending or the combined upward and downward cross bending and straightening of the band may be alternatively effected in each individual or in a plurality of successive roll stands.

Needless to state that in all of the above mentioned embodiments of the invention one or more straightening roll stands may be added to impart to the band its final form.

I claim:

1. Method for the continuous production of metall c broad strips and bands comprising feeding a straight metal blank having a rectangular cross area into a rolling mill having a plurality of successive roll stands, a pair of horizontal working rolls in each stand, the working face of successive roll stands, bending the same in a direction transversely of its traveling direction over its entire cross sectional area into the shape of one continuous arc with one point of maximum bend occurring in the center of the sheet at a max mum distance from its longitudinal axis and simul aneously reducing its cross sectional area.

2. Method for the continuous production of metallic broad strips and bands comprising feeding a straight metal blank having a rectangular cross area into a rolling mill having a plurality of successive roll stands. a pair of horizontal working rolls in each stand the working face of the one roll of each individual pair being convexshaped and the working face of the second roll of each individual pair being correspondingly concave-shaped, passing said blank through said 3. Method for the continuous production or metallic broad strips and bands comprising feeding a straight metal blank having a rectangular cross area into a rolling mill having a plurality of successive roll stands, a pair of horizontal working rollsin each stand, the working face of the one roll of each individual pair being convexshaped and the working face of the second roll of each individual pair being correspondingly concave-shaped, passing said blank through said successive roll stands, bending the same downward in a direction transversely of its traveling direction over its entire cross sectional area into the shape of one continuous arc with one point of maximum bend occurring in the center of the sheet at a maximum distance tromits longitudinal axis and simultaneously reducing its cross sectional area.

4. Method for the continuous production of metallic broad strips and bands comprising feeding a metal blank having a rectangular cross area into a rolling mill having a plurality oi successive r011 stands with curved and straight working rolls in the successive stands, alternately passing said blank through said successive roll stands, bending the same in a direction transversely of its traveling direction over its entire cross sectional area into the shape of one continuous arc with one point or maximum bend occurring in the center of the sheet at a maxi- .mum distance from its longitudinal axis, straightening the same and simultaneously reducing its cross sectional area.

5. Method 'for the continuous production ofentire cross sectional area into the-shape of one continuous arc with one point of maximum bend occurring in the center of the sheet at a maximum distance from its longitudinal axis and straightening the same and simultaneously reducing its cross sectional area.

6. Method for the continuous production 0! metallic broad strips and bands comprising feeding a metal blank having a rectangular cross area into a rolling mill, having a plurality of successive roll stands with curved and straight working rolls in the successive stands, alternately passing said blank through said successive roll stands, bending the same downward in a direction transversely of its traveling direction over its entire cross sectional area into the shape of one continuous arc with one point of maximum bend occurring in the center of the sheet at a maximum distance from its longitudinal axis and straightening the same and simultaneously reducing its cross sectional area.

HEINRICH PUPPE. 

